1 //===----------------------------------------------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // UNSUPPORTED: libcpp-has-no-threads
11 
12 // <mutex>
13 
14 // template <class Mutex> class unique_lock;
15 
16 // void unlock();
17 
18 #include <mutex>
19 #include <cassert>
20 
21 bool unlock_called = false;
22 
23 struct mutex
24 {
lockmutex25     void lock() {}
unlockmutex26     void unlock() {unlock_called = true;}
27 };
28 
29 mutex m;
30 
main()31 int main()
32 {
33     std::unique_lock<mutex> lk(m);
34     lk.unlock();
35     assert(unlock_called == true);
36     assert(lk.owns_lock() == false);
37     try
38     {
39         lk.unlock();
40         assert(false);
41     }
42     catch (std::system_error& e)
43     {
44         assert(e.code().value() == EPERM);
45     }
46     lk.release();
47     try
48     {
49         lk.unlock();
50         assert(false);
51     }
52     catch (std::system_error& e)
53     {
54         assert(e.code().value() == EPERM);
55     }
56 }
57